A dry soluble powder with humic acid concentration of 85%. Derived from the mineral leonardite.
Humic acids are the wild-card molecules of soil physics and chemistry, performing complex functions by way of several different electrical and chemical reactions. Both powerful chelators and bind-all stabilizers, humic acids can prevent leaching of trace minerals into subsoil and increase uptake rate of micronutrients. They neutralize soil pH and reduce the toxicity of heavy metals. With a water-holding capacity of seven times their volume, they contribute greatly to soil structure and indirectly buffer soil temperature. They stimulate growth of foliage and roots significantly. Humic acids also have the ability to retain soil carbon for more than 1000 years, especially in conjunction with farming practices that prevent their decomposition, such as minimal or no tillage, cover cropping and mulching. These same practices increase the microbial populations responsible for new humus formation and cycling.
Best used as a foliar feed in combination with Fulvic Acid, the other soluble component of humus. Can also be applied directly to roots or in the soil before seeding or planting. Humic acids are only soluble in alkaline diluents, so test the pH of your solution to make sure it is above 7.0 before applying.
Caution: Higher than recommended concentrations of humic substances in soil can be inhibitive to proper plant growth. Don’t overdo it! See the fertigation chart for application rates. MOFGA
8167 Humic Acids SP
Log in to start or resume an order
Inoculants, soil amendments, fertilizers, livestock supplies and pesticides are labeled as: OMRI: Organic Materials Review Institute. Most state certifying agencies, including MOFGA, accept OMRI approval. MOFGA: Reviewed and approved by the Maine Organic Farmers & Gardeners Association Certification Services. Allowed for use on MOFGA-certified farms. Check with your certifier. WSDA: Listed by the Washington State Department of Agriculture’s Organic Certification division for use in organic agriculture in Washington State. MOFGA has indicated that they will accept products on this list for their certification program. Check with your certifier. Nat’l List: One-ingredient products on the NOP* List of Allowed Substances (subpart G of the Organic Foods Production Act, sections 205.601-606). Check with your certifier. AYC: Ask your certifier. Has not been reviewed by a certifier, but the active ingredient is allowed. Ask your certifier. Not Allowed: A few of the products we list are not allowed for organic production but we think they have a place in sensible agriculture and can be used when certification is not an issue.
Click here for our list of soil amendments, fertilizers, and disease and insect controls along with their certification status and manufacturers.